Sorry at first putting this here in the dev-list... But this seems
to
be a
problem which can only be solved by development.
Let's go:
Lately a very obscure thing happened to an xServe of our deployment.
The
xServe was killed (became totally unresponsive, neither ssh nor
Admin-Tools
did work to restart the machine) by some cause which I am still
searching
for.
this was also the first time I asked myself why I cannot restart an
xServe
via Admin-Tools if at least some webObjects-apps still were working.
By the
way: this made me code a crontab-entry which regularly checks this
situation
and reacts in time to keep the machine responsive.
The facts:
*** In "/var/log/" I found following amazing entry using "ls -lF"
after we
restarted the machine manually:
-rw-r--r-- 1 root wheel 34727006208 1 Aug 05:30
webobjects.log.1
*** After checking disk-capacity beeing left I found:
Filesystem 512-blocks Used Avail Capacity
Mounted
on
/dev/disk0s3 160574256 159498416 563840 100% /
devfs 180 180 0 100% /dev
fdesc 2 2 0 100% /dev
<volfs> 1024 1024 0 100% /.vol
/dev/disk1s3 489963440 489963424 16 100%
/Volumes/ServerHD
automount -nsl [324] 0 0 0 100%
/Network
automount -fstab [375] 0 0 0 100%
/automount/Servers
automount -static [375] 0 0 0 100%
/automount/static
*** All disks were 100% full!
*** After immediately deleting the monster-logfile of webobjects
because
otherwise I may have ended up unable to even boot the machine
another
time... I checked the "/var/log/system.log" which showed:
Jul 29 08:02:22 <realServerNameReplaced> last message repeated 2
times
Jul 29 08:18:36 <realServerNameReplaced> kernel: ipfw: 65000 Deny
TCP
64.191.227.251:1331 131.188.76.13:1433 in via en0
Jul 29 08:18:39 <realServerNameReplaced> kernel: ipfw: 65000 Deny
TCP
64.191.227.251:1331 131.188.76.13:1433 in via en0
Jul 29 08:38:51 <realServerNameReplaced> kernel: ipfw: 65000 Deny
TCP
213.138.52.133:4428 131.188.76.13:10000 in via en0
Jul 29 08:38:54 <realServerNameReplaced> kernel: ipfw: 65000 Deny
TCP
213.138.52.133:4428 131.188.76.13:10000 in via en0
Jul 29 10:43:53 <realServerNameReplaced> kernel: ipfw: 65000 Deny
TCP
132.176.163.104:3169 131.188.76.13:1433 in via en0
Jul 29 10:43:56 <realServerNameReplaced> kernel: ipfw: 65000 Deny
TCP
132.176.163.104:3169 131.188.76.13:1433 in via en0
Jul 29 10:56:26 <realServerNameReplaced> kernel: file: table is full
Jul 29 10:56:54 <realServerNameReplaced> last message repeated 214
times
Jul 29 10:56:57 <realServerNameReplaced> kernel: ble is full
Jul 29 10:56:57 <realServerNameReplaced> kernel: file: table is full
Jul 29 10:56:58 <realServerNameReplaced> last message repeated 147
times
Jul 29 10:56:59 <realServerNameReplaced> kernel: ble is full
Jul 29 10:56:59 <realServerNameReplaced> kernel: file: table is full
Jul 29 10:57:32 <realServerNameReplaced> last message repeated 95
times
Jul 29 10:58:22 <realServerNameReplaced> last message repeated 237
times
Jul 29 10:58:22 <realServerNameReplaced> postfix/qmgr[339]: fatal:
scan_dir_push: open directory incoming/0: Too many open files in
system
Jul 29 10:58:22 <realServerNameReplaced> kernel: file: table is full
Jul 29 10:58:42 <realServerNameReplaced> last message repeated 5
times
Jul 29 11:01:04 <realServerNameReplaced> last message repeated 9
times
Jul 29 11:03:20 <realServerNameReplaced> last message repeated 33
times
Jul 29 09:03:20 <realServerNameReplaced>
/usr/libexec/crashreporterd:
crashdump[8477] exited due to signal 5
Jul 29 11:03:22 <realServerNameReplaced> kernel: file: table is full
Jul 29 11:03:23 <realServerNameReplaced> last message repeated 4
times
Jul 29 11:03:24 <realServerNameReplaced> kernel: ull
Jul 29 11:03:24 <realServerNameReplaced> kernel: file: table is full
Jul 29 11:03:24 <realServerNameReplaced> last message repeated 198
times
Jul 29 11:03:24 <realServerNameReplaced> lookupd[243]: NetInfo
connection
failed for server 127.0.0.1/local
Jul 29 11:03:24 <realServerNameReplaced> kernel: file: table is full
*** and so on...
*** Digging a bit more in the logfiles, i found out that some files
which
get usually read by one of our WebObjects-apps could not be read
because auf
this too much open files error.
*** Having monitored our server now for 3 days, i recognize that the
number
of open files slightly rises up for one of our WebObjects apps
*** typing 'lsof | grep -c "java"' with root privileges brings up
somthing
like this:
java 9786 root 1307 can't
read
file
struct from 0x05737b90
java 9786 root 1308 can't
read
file
struct from 0x056b358c
java 9786 root 1309 can't
read
file
struct from 0x056b3a78
java 9786 root 1310r VREG 14,5 318 1049897 / --
DNA_TL012e0f02F0304505T10602e3f07F0823d8e8f0923EF102321LEFT121013T14
T1
515161
0251723EF18TOP19F020F021T1.info
java 9786 root 1311 can't
read
file
struct from 0x05739720
java 9786 root 1312r VREG 14,5 318 1049897 / --
DNA_TL012e0f02F0304505T10602e3f07F0823d8e8f0923EF102321LEFT121013T14
T1
515161
0251723EF18TOP19F020F021T1.info
java 9786 root 1313r VREG 14,5 318 1049897 / --
DNA_TL012e0f02F0304505T10602e3f07F0823d8e8f0923EF102321LEFT121013T14
T1
515161
0251723EF18TOP19F020F021T1.info
java 9786 root 1314r VREG 14,5 318 1049897 / --
DNA_TL012e0f02F0304505T10602e3f07F0823d8e8f0923EF102321LEFT121013T14
T1
515161
0251723EF18TOP19F020F021T1.info
*** where "9786 " is the processid of our webobjects app and i
register
about 1319 open files. The files shown here are the ones which get
read
regularly and sometimes they get written. Checking the maximum
number
of
files which are allowed per process using "sysctl -a" revealed:
kern.maxfilesperproc = 10240
I suppose that an increasing number of these open files may have
caused the
"wotaskd" to writte this repeatingly in the monsterfile until the
complete
standstill of the server because of missing diskspace was
unavoidable.
*** NOW my question: Has anyone also experienced such a behaviour?
What may
have caused such a complete and from my point of view severe
breakdown? At
the same time methods to prevent this are welcome. Does anyone have
experience with how to keep an xServe at least "restartable" no
matter how
weird the circumstances are? (perhaps some daemon running and
listening for
the ultimate restart-request on the net)
By the way, is there a maximum limit in the number of files which
can
be put
in ONE directory? What happens if this limit is exceeded?
Any experience or helpful hint would be welcome.
Regards,
Helge
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